R group binds to amine group?

[wormboge]

Okay, I'm reading the Examkrackers Biology 1 book, and am hoping that someone can clarify how an R group binds to an amine group. I'm having trouble picturing this:

Page 14: "In addition to these forces, turns that disrupt both alpha helix and beta pleated sheet formation are induced by amino acid proline due to its physical structure: the R group binds to the amine group, causing proline to be more rigid than a typical amino acid."

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[CommyO]

Recall the structure of proline. It's essentially a cyclic structure and the R group is an ethane

Here's glycine

and here's proline

Proline inhibits helix and beta sheet formation by causing beta-turns. Also has a distinct Ramachandran plot in a peptide with multiple proline and glycine residues